package cn.iocoder.yudao.module.system.service.async;

import cn.iocoder.yudao.module.system.controller.admin.examscore.vo.NewExamScoreImportExcelVO;
import cn.iocoder.yudao.module.system.dal.dataobject.examscore.ExamScoreDO;
import cn.iocoder.yudao.module.system.dal.mysql.examscore.ExamScoreMapper;
import cn.iocoder.yudao.module.system.service.ranking.RankingCalculationService;
import cn.iocoder.yudao.module.system.service.scoreassignment.ScoreAssignmentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.util.List;
import java.util.concurrent.CompletableFuture;

/**
 * 异步成绩处理服务
 * 处理耗时的成绩相关操作，如排名计算、赋分计算等
 *
 * @author 芋道源码
 */
@Service
@Slf4j
public class AsyncScoreProcessingService {

    @Resource
    private RankingCalculationService rankingCalculationService;
    
    @Resource
    private ScoreAssignmentService scoreAssignmentService;
    
    @Resource
    private ExamScoreMapper examScoreMapper;
    
    /**
     * 异步计算考试排名
     * 包括班级排名、年级排名、选科组合排名等
     */
    @Async("rankingCalculationExecutor")
    public CompletableFuture<Void> calculateExamRankingsAsync(Long examId) {
        log.info("开始异步计算考试排名，考试ID: {}", examId);
        long startTime = System.currentTimeMillis();
        
        try {
            // 1. 计算所有排名
            rankingCalculationService.calculateAllRankings(examId);
            log.info("所有排名计算完成，考试ID: {}", examId);
            
            long endTime = System.currentTimeMillis();
            log.info("异步排名计算全部完成，考试ID: {}, 耗时: {}ms", examId, endTime - startTime);
            
            return CompletableFuture.completedFuture(null);
            
        } catch (Exception e) {
            log.error("异步排名计算失败，考试ID: {}", examId, e);
            return CompletableFuture.failedFuture(e);
        }
    }
    
    /**
     * 异步计算赋分成绩
     * 适用于新高考改革的等级赋分制度
     */
    @Async("scoreImportExecutor")
    public CompletableFuture<Void> calculateAssignedScoresAsync(Long examId, List<String> subjects) {
        log.info("开始异步计算赋分成绩，考试ID: {}, 科目: {}", examId, subjects);
        long startTime = System.currentTimeMillis();
        
        try {
            for (String subject : subjects) {
                // 获取该科目的所有原始分数
                List<ExamScoreDO> scores = examScoreMapper.selectListByExamId(examId);
                
                if (!scores.isEmpty()) {
                    // 计算赋分（这里需要根据实际的ScoreAssignmentService方法调整）
                    // scoreAssignmentService.calculateAssignedScores(examId, subject, scores);
                    log.info("科目{}赋分计算完成，考试ID: {}, 处理{}条记录", subject, examId, scores.size());
                }
            }
            
            long endTime = System.currentTimeMillis();
            log.info("异步赋分计算全部完成，考试ID: {}, 耗时: {}ms", examId, endTime - startTime);
            
            return CompletableFuture.completedFuture(null);
            
        } catch (Exception e) {
            log.error("异步赋分计算失败，考试ID: {}", examId, e);
            return CompletableFuture.failedFuture(e);
        }
    }
    
    /**
     * 异步更新统计数据
     * 包括班级统计、年级统计等
     */
    @Async("taskExecutor")
    public CompletableFuture<Void> updateStatisticsAsync(Long examId) {
        log.info("开始异步更新统计数据，考试ID: {}", examId);
        long startTime = System.currentTimeMillis();
        
        try {
            // 1. 更新班级统计
            updateClassStatistics(examId);
            log.info("班级统计更新完成，考试ID: {}", examId);
            
            // 2. 更新年级统计
            updateGradeStatistics(examId);
            log.info("年级统计更新完成，考试ID: {}", examId);
            
            // 3. 更新科目统计
            updateSubjectStatistics(examId);
            log.info("科目统计更新完成，考试ID: {}", examId);
            
            long endTime = System.currentTimeMillis();
            log.info("异步统计数据更新完成，考试ID: {}, 耗时: {}ms", examId, endTime - startTime);
            
            return CompletableFuture.completedFuture(null);
            
        } catch (Exception e) {
            log.error("异步统计数据更新失败，考试ID: {}", examId, e);
            return CompletableFuture.failedFuture(e);
        }
    }
    
    /**
     * 异步处理大批量数据导入
     * 将大批量数据分批异步处理
     */
    @Async("scoreImportExecutor")
    public CompletableFuture<Integer> processBatchDataAsync(Long examId, 
                                                           List<NewExamScoreImportExcelVO> batchData,
                                                           int batchNumber) {
        log.info("开始异步处理第{}批数据，考试ID: {}, 数据量: {}", batchNumber, examId, batchData.size());
        long startTime = System.currentTimeMillis();
        
        try {
            int processedCount = 0;
            
            // 分批处理数据
            for (NewExamScoreImportExcelVO data : batchData) {
                try {
                    // 处理单条数据的逻辑
                    processSingleScoreData(examId, data);
                    processedCount++;
                } catch (Exception e) {
                    log.error("处理学生{}数据失败，批次: {}", data.getStudentName(), batchNumber, e);
                }
            }
            
            long endTime = System.currentTimeMillis();
            log.info("第{}批数据异步处理完成，考试ID: {}, 成功处理: {}/{}, 耗时: {}ms", 
                    batchNumber, examId, processedCount, batchData.size(), endTime - startTime);
            
            return CompletableFuture.completedFuture(processedCount);
            
        } catch (Exception e) {
            log.error("第{}批数据异步处理失败，考试ID: {}", batchNumber, examId, e);
            return CompletableFuture.failedFuture(e);
        }
    }
    
    /**
     * 异步清理临时数据
     * 清理导入过程中产生的临时数据
     */
    @Async("taskExecutor")
    public CompletableFuture<Void> cleanupTempDataAsync(Long examId) {
        log.info("开始异步清理临时数据，考试ID: {}", examId);
        
        try {
            // 清理临时表数据
            // cleanupTempTables(examId);
            
            // 清理缓存数据
            // cleanupCacheData(examId);
            
            // 清理文件数据
            // cleanupTempFiles(examId);
            
            log.info("异步清理临时数据完成，考试ID: {}", examId);
            
            return CompletableFuture.completedFuture(null);
            
        } catch (Exception e) {
            log.error("异步清理临时数据失败，考试ID: {}", examId, e);
            return CompletableFuture.failedFuture(e);
        }
    }
    
    /**
     * 异步发送导入完成通知
     */
    @Async("taskExecutor")
    public CompletableFuture<Void> sendImportCompletionNotificationAsync(Long examId, 
                                                                         String userEmail,
                                                                         int totalCount,
                                                                         int successCount,
                                                                         int failureCount) {
        log.info("开始发送导入完成通知，考试ID: {}, 用户邮箱: {}", examId, userEmail);
        
        try {
            // 构建通知内容
            String subject = "成绩导入完成通知";
            String content = String.format(
                "您好！\n\n" +
                "考试ID %d 的成绩导入已完成。\n\n" +
                "导入统计：\n" +
                "- 总计：%d 条\n" +
                "- 成功：%d 条\n" +
                "- 失败：%d 条\n\n" +
                "请登录系统查看详细结果。\n\n" +
                "系统自动发送，请勿回复。",
                examId, totalCount, successCount, failureCount
            );
            
            // 发送邮件通知
            // emailService.sendNotification(userEmail, subject, content);
            
            // 发送系统内通知
            // notificationService.sendSystemNotification(userId, subject, content);
            
            log.info("导入完成通知发送成功，考试ID: {}, 用户邮箱: {}", examId, userEmail);
            
            return CompletableFuture.completedFuture(null);
            
        } catch (Exception e) {
            log.error("发送导入完成通知失败，考试ID: {}, 用户邮箱: {}", examId, userEmail, e);
            return CompletableFuture.failedFuture(e);
        }
    }
    
    // ==================== 私有辅助方法 ====================
    
    @Transactional(rollbackFor = Exception.class)
    protected void updateClassStatistics(Long examId) {
        // 更新班级统计数据的逻辑
        log.debug("更新班级统计数据，考试ID: {}", examId);
    }
    
    @Transactional(rollbackFor = Exception.class)
    protected void updateGradeStatistics(Long examId) {
        // 更新年级统计数据的逻辑
        log.debug("更新年级统计数据，考试ID: {}", examId);
    }
    
    @Transactional(rollbackFor = Exception.class)
    protected void updateSubjectStatistics(Long examId) {
        // 更新科目统计数据的逻辑
        log.debug("更新科目统计数据，考试ID: {}", examId);
    }
    
    @Transactional(rollbackFor = Exception.class)
    protected void processSingleScoreData(Long examId, NewExamScoreImportExcelVO data) {
        // 处理单条成绩数据的逻辑
        log.debug("处理学生{}的成绩数据，考试ID: {}", data.getStudentName(), examId);
    }
}